Dust stripping for screens



May E, 192%. 1,493,750

.H. E. HOLBROOK DUST STRIPPING FOR SCREENS Filed Feb. 15; 1922 2Sheets-Sheet 1 May 13, 192%.

H. E. HOLBROOK DUST STRIPPING FOR SCREENS 2 Sheds-Sheet 2 Filed Feb.15,-1922 Patented May 13, E24,

HENRY E. HOLBROQK, OF BOSTON, MASSACHUSETTS.

' nus'r s'rnrrrme ron scannnrs.

Application filed February 15, 1922. Serial No. 586,782.

To all whom it may concern:

' cate instruments, as for example, automatic or mechanical telephoneexchanges, which demand air and at the same time means for preventingthe intrusion of dust and dirt into said compartments. Accordingly,window screens of exceedingly fine mesh are used, as for example, fromforty to sixty strands per inch of fine wire, said screens needingthorough dust stripping around and between the same to prevent saidintrusion of dust and dirt.

The object of the present improvement is to provide a method of duststripping for the joints between the window frame and the screen framesand between the meeting rails of said screen frames to entirely closeall openings around and between said screen frames and said windowframes to thereby exclude all dust and dirt, said screen frames beingprovided with a screen fabric of such fine mesh as to practicallyprevent said dust and dirt passing therethrough; and the inventionconsists in the novel features and combinations hereinafter set forthand claimed.

In the drawings, Figure 1 is an elevation of the window frame with thetwo screen frames therein. Fig. 2 is a crosswise sectional view at line2-2 in Fig. 1; and Fig. 3 is a crosswise sectional view at line 3-3 inFig. 1, showingthe preferred construction and arrangement of the parts,and the oppositely inclined dust strips at the left side of the same, aswell as the felt plug on the right side between the two window screensand theguide strip, one of the window screens being shown in dottedoutline in Fig. 2. Fig. 4 is a perspective view of a portion of thelateral dust strip showing the preferred construction and arrangement ofthe same, ready for attachment in the double guide strip on the windowframe. Fig. 5 is a perspective view of a portion of the window framewith the window screens therein,

the frame and screens being shown in vertical section to show thepreferred construction and arrangement of the same. Fig. 6 is aperspective view of the protective dust strip for the joint between thetwo window to screens to close said joint and prevent all dust and dirtfiltering through the same.

Like characters of reference refer to corresponding parts in the severalviews.

The numeral 10 designates the preferably at sheet metal frame side whichis cut and bent from flat sheet metal strip by means of suitable diesand is shaped to form a lengthwise groove 11 along the inner edges ofthe frame sides for the attachment of the screen to fabric 12 in thegroove 11, a resilient split tube 13 being preferably used for holdingsaid screen fabric within said groove.

The top rail of the upper screen 14: and the bottom rail of the lowerscreen 15 preferably as felt, the edges of which are held by the foldeeed sheet metal strip 19.

The meeting joint 22' between the rails 23 and 24: of the upper screen14 and the lower screen 15 preferably is closed by means of thecurvingly bent sheet metal dust strip 20, as

which has the angularly bent edge 21 for insertion in the groove 11 inthe top rail 24 of the lower screen 15 to be held by the split tube 13along with the screen fabric 12 in said groove 11. The dust strip 20 isso as shaped that it presses over against the lower rail 23 of the upperscreen frame 14' and thence back towardthe top of said top rail of thelower screen frame 15, thereby providing a double closure as it were ofthe 05.

joint 22 between the top rail 24 and the bottom rail 23 throughout itslength.

The upper and lower screens 14 and 15 are slidably mounted on the doubleguide strip 25 on ways 3?: and 34 at each side of the win- 30o dow frame26, and the outer edge 27 of the lateral frame side 28 of each of theupper and lower screens is grooved to slidably fit upon the guideways25. The opposite lateral screen edge 29 is channeled and the res spring30 is mounted therein and shaped with a grooved outer bowing portion 31to fit upon the curved surface of the guide strip 25. A set screw 32 isprovided in the frame side to hold each spring 30 firmly to Me a closelyadjusted position as shown in Fig. 2, yet permitting the withdrawal ofthe screen from the window frame by the withdrawal of the set screw 32,as shown in Fig. 3.

The guideways and 34 on the uide strip 25 are spaced apart so that thesliding screens may pass alongside one another without contacting, andthe weather strips 35 and 36 are attached to the guide strips 25 betweenthe sliding ways 33 and 34. Said guide strips 35 and 36 are bent inopposite directions toward the screen 14 or 15 alongside which it isattached, and the rubbing or contacting edge 37 of the guide strip ispreferably given, a return bend so that it will slide easily upon thelateral frame side Without cutting or marring the same. The base 38 isturned at right angles and iven a double return bend of a width sufcientto preferably fill the space between the guideways 33 and 34 and fitclosely within the channel 39 between the guideways 33 and 34, and isattached therein by means of small tacks or screws, which constructionfirmly holds and supports the projecting edge portion 37.

The described dust strippin closes all the, joints around and between te upper and lower window screens and the window casing with theexception that opposite the meeting rails 23 and 24 at their outer endsand their joining with the lateral rail sides 28, an unclosed openingremains in the .channel 29 for about the width of the joint 22, whichopening is preferably closed by means of a strip of felt 40 ofsufiicient length for said closure. Said felt is preferred because ofits resilience, though other materials might be used.

The springs 30 press the screen frames firmly against the guideways 33and 34 in the rooves 27, thereby preventing any dust or irt fromentering at the slidin joint between these two parts. A spring bolt orlatch 41 is preferably provided in the lower screen frame 15 as shown inFigs. 1 and 3 to support and lock said screen 15 in the lower position,slight spaced openings being provided in the guideways for said bolt 41,the inner end of the bolt having a hole therein for the insertion of ahook 42 for withdrawing the bolt 41.

It is apparent that with the screen frames pressed tightly against theguideways 33 and 34 in the groove 27 and the felt plug 40 in the groove39 in the guide strip 25 in combination with a dust stripping 18 for theto rail of the upper screen and bottom rail 0 the lower screen incoinbination with the sheet metal'dust strip 20 between the meetingrails 23 and 24 of the screen frames and the oppositely inclined sheetmetal dust strips 35 and 36 for. the

channeled sides of the screen frame, all

reeaaeo openings between the window frame 26 and the screen frames aswell as between the meeting rails of said screen frames are closed,thereb shutting out all dust and dirt as desired. he end of the feltdust stripping 18 for the top rail of the upper screen and the lowerrail of the lower screen should interlap with the lower ends of thesheet metal dust strips 35 and 36 so as to close the corner jointcompletely on the channel side of the upper and lower window screens 14and 15.

It is obvious also that the set screws 32 may be set so firmly againstthe sprin s 30 and the sliding ways 33 or 34 as to firm y hold the upperscreen 14 or the lower screen 15 against movement, that is, so that itcannot be moved up or down or removed without loosening said set screws,thereby preventing the sliding or removal of the screen by thoseignorant of the purpose of the screens.

What is claimed as new is:

1. The combination with a fine mesh screen, of a dust strip for the toprail of the upper screen and for the bottom rail of the lower screen andfor the joint between the meeting rails of said upper and lower screens,and dust strips on the guide strips for said upper and lower screenslapping onto said screens and onto said top and hottom rail dust stripsat their end portions to close the openings around said end por tionsand around said screens and in the groove on said guide strip.

2. The combination with a fine mesh screen, of a looped felt dust strifor the upper edge of the top rail of t e upper screen and for the loweredge of the bottom rail of the lower screen, a spring sheet metal duststrip attached to one of the meeting rails and closing the joint betweensaid meeting rails of said upper and lower screens, a sheet metal duststrip attached in the guide strips for each of said screens slidablybearing against the side of said screens and against the ends of saidfelt dust strips on the to and bottom rails of said screens to close t etop and bottom corner joints for said screen.

3. A sheet metal dust stri comprising a strip of spring sheet metalfolded upon itself to form a base the width of the groove between theguide ways on a double guide strip, said folded portion of said duststrip extending out at substantially right angles, the contacting edgeportion of said strip given a return bend, said dust strip attachable bytacks or screws in said groove in said double guide strip and shaped topress against the side of the screen frame or sash.

4. The combination with a screen frame of a dust strip for the jointbetween the meeting rails of screen frames or sash, said neesye o tripsformed with a groove alongside the to thereby close the joint betweensaid meet- 10 same, and a resilient tubular strip for ating railsthroughout the length of the same. taching the screen fabric in saidframe side, In testimony whereof I have afiixed my said dust strip beingshaped angularly to signature in the presence of two witnesses. 5 itwithin said groove and be held in place by said resilient tubularstrip,- said sheet HENRY E. HOLBROOK. metal dust strip curvinglyinclined against Witnesses: the opposite meeting raii'and back against(303mm: V. SWANSON,

the side of the rail to which it is attached I A. W. Ken-m.

